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Thread: Carbon Fibre
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4th July 2012, 02:40 PM #1
Carbon Fibre
Hi all,
anyone in Perth or surrounding araes have any Carbon Fibre offcuts for some experimental cnc work?
CheersIf ya can't make it perfect, make it rustic
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4th July 2012, 10:26 PM #2
some in darwin , but the resin i use is 120mpa and will blunt a cutting bit pretty quick, and not much flat stock off cuts , most my carbon fibre is moulded into shape , diamond grinding burr's " grind " it well with coolant
what were you after , flat sheet ,"3k twill weave" ? ( most common ) how thick ? how big ?
i make most my bulk fibre out of 12k tow ,using 3k twill weave as a top layer for looks only ,manly so the strength is in the direction i want
cheers kenhow come a 10mm peg dont fit in a 10mm hole
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4th July 2012, 11:30 PM #3
just looked in the shed , have a dud (well my 3rd attempt ) violin bottom plate ( too thin ) 3-5 layers 3k twill about 3/4of a mm thick , about A4 size , but shaped not flat , but you can cut flattish bits out of it
looks like my first batch of resin witch was 60mpa ( only as hard as concrete)
im your address and ill send it offhow come a 10mm peg dont fit in a 10mm hole
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5th July 2012, 12:18 PM #4
Hi Ken,
Thanks for your info on the carbon fibre you are making, a friend wants me to try and fashion some heel gaurds for his motorbike and they will need to be around 3 mm thick.
I was just trying to source some local off cuts , thanks for your offer but 3/4mm thick is no good.
Cheers GaryIf ya can't make it perfect, make it rustic
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5th July 2012, 02:15 PM #5
the making of carbon fibre is really quite simple , the simpelest way is the same as fibre glass , but with better quality materials
3k twill is sold by the meter on ebay , i got a heap (20lm) for $20 a m^2 out of melasia , (dont pay more than $40m^2) ,the only seller of carbon fibre in Darwin charges $160 m^2
the resin is important , dont use fibre glass resin from "diggers" as its not an epoxy , west system 107 is a good place to start , and is a dam good glue to have in the work shop
for a guard , i would use Kevlar as it is more impact resistant than carbon fibre , same story , use it the same as fibre glass , and is easy to get hold of ,
the harder the resin the better strength and the manufacturer of " west system " epoxys makes some great carbon fibre resins , ask for a product catalogue at the west system reseller
there are several ways to make " composites "
1) WET LAYUP ;wet down the fabric with a paint brush , and build up the layers , ( the use of a vacuum bag is normal to squeeze out the excess resin , and make the part as light as possible , but it will work with out it )
2) INFUSION , laying up all the layers dry , placing in a vacuum bag , then adding the resin via a tap ( good on large jobs where cure time will be a hindrance) west sytem 107 is too thick for infusion , i use this method
3) PREPREG , the processional way , the material come pre resined with a high temp set resin , and once layer out ,it needs heat and pressure in an autoclave to turn it hard ( not for the hobbiest )
Kevlar has better ware resistance than carbon fibre and better impact resistance, and penetration resistance ( even fibre glass stands up to ware better than carbon fibre )
carbon fibre is only good at tension , and dose it real well
there composites , one product wont do it all , a mix of " bullet proof " Kevlar , over a carbon core would be unbreakable , and you can even purchase 50/50 Kevlar/ Carbon cloth on eBay that comes in a few different colours Carbon Fiber Kevlar hybrid Cloth fabric Twill (3K) 100cm x30.5cm (39"X12") plain | eBay
cheers kenhow come a 10mm peg dont fit in a 10mm hole
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5th July 2012, 08:06 PM #6
forgot to mention that Carbon Fibre conduits electricity , so its dust is not only harmful to humans , if a fibre of dust gets into your electronics IT WILL SHORT IT OUT
cheers kenhow come a 10mm peg dont fit in a 10mm hole
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5th July 2012, 08:26 PM #7
I purchased carbon fibre from these guys when making my Dark Knight suit.
Carbon fiber Australia
Cheers
Brad.
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